Back-pressure valve.



PATENTED APR. 24, 1906.

0, A. BUSH. BACK PRESSURE VALVE,

APPLICATION FILED B11024, 1004.

UNITED srArrns PATENT FFIC.

CHARLES ADAMS BUSH, OF NORTH EAST, PENNSYLVANIA.

BACK PRESSUHE. VALVE.

Specification of Letters Patent.

Application filed December 24,1904. Serial No. 238,233.

.Eatented April 24, race.

v lowing is'a specification.

This invention relates to valves of that type which open under'the pressure of fluid in one direction and which are movable to closed osition when the ressure ceases or falls be ow a predetermined pQint.

The principal object of the invention is to provide a novel. form of valve in which friction is reduced to a minimum and in which the arts are so arranged that the valve will he s ightly turned each time it is o erred in order to form a tight joint between t e valve and its seat.

A still further object of the invention is to provide a valve of this type in which the back pressure cannot tend to move the valve from open to closed position.

With these and other objects in view, as will more fully hereinafter a pear, the invention consists in certain nove features of construction and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claim, it. being under stood that various changes in the form, proportions, size, and minor details oi the structure may be made without departing from;

the spirit or sacrificing any of the advantages of the invention.

in the accompanying drawings, Figure 1 is a sectional elevation of a valve constructed in accordance with the invention. Fig. 2 is a similar View oi the same, showing the. valve in open position. Fig. 3 is a sectional plan view oi the valve on the line 3 3 of" Fig. .2.

Similar numerals of relcrcnce are 0111- ploycd to indicate corresponding parts throu hout the several fi ures oi the rawn r.

ings.

may be adjusted y t e plug 12.

. lot 25 for the leads an outlet-pipe 16 for the passage of the fluid from the casing, and at a point in alinement with said pi e the' diameter of the cylinder is enlarged, orming a continuous annular groove 17, that will perniit thefree passa e of said fluid.

he valve 15 has a transverse artition 18, against the upper side of which ears a helical compression-s rin 19, the stress of which In the circular wall of the valve'at a point below the partition 18 are arranged a number of ports ra ial of the valve, thus presenting inclined walls which are acted upon by the steam or other fluid each time the valve is opened, and said valve is thus rotated, and the same parts of the valve and seat will not come into contact at any two consecutive closings of the valve. By this means the wear is rendered more uniform and neither the valve nor its seat will require frequent regrinding.

On the exterior of the valve are packingstrips 21, which may be set in suitable annuor dpassages 21, which extend on lines non lar grooves formed in the valve, the. number of packing-rings being increased or diminished in accordance with the pressure and character of the fluid being controlled.

In operation the fluid under pressure acts on the partition 18 and moves the valve up to the position shown in Fig. '2, so that the fluid can pass through the ports 21 to the channel 17 and thence to the outlet 16. When the pressure is cut off or is reduced beyond a predetermined point, the valve will be moved to closed position partly by gravity and partly bythe stress of the spring 19.

in the lower ortion of the casing is an iniiilld under pressure, and this inlet is provided with a seat 26 for a spring closed valve 27, that opens under pressure.

The stem 28 of this valve is eXtended out through a suitable opening in the side of the casing and constitutes an indicating device for determining the pressure of the fluid, said stem being provided with griiduations, if necpssary.

Having thus described the invent-ion, what is claimed is- In combination, a cylindrical valve-casing having at one end an entrance-port, and at one side a discharge-port, the inner wall of 1 the casing having an annular groove in comon which rests the correspondingly-shapcd lower end of an approximately cup-shaped valve 15.

From onc side of the cylinder 2 in duration with said discharge-port, and the ion ll' portion of said casing being reduced in diameter to form an annular valve-scat, a

eylindricalvalve arraned within said casvalve, and the upper recess lar groove and the discharge-port when the lug, said valve being provided with end recesses separated by a solid imperfomte partition, the Wall of the valve below the partil tion being provided with discharge-ports arranged'on lines tangential With respect to the being arranged to receive one end of a valve-closing spring, that portion of the valve above the tangentisil ports serving to entirely close the annuand means for adjusting spring.

the stress of said valve is on its seat, a valve-closing spring In testimony that I claim the foregoing as I 5 ailixed my signature 

